The most efficient way to download multiple books simultaneously to a Kindle E-reader or the Kindle for PC app is to group them into a collection.
: Select the books you want to download and add them to a new or existing collection (e.g., "Main Library"). On Your Device : Open your Library and filter by Collections . Long-press the collection name (or click the three dots). Select Download all items . Method 2: Batch Delivery via Amazon Content Library how to download all my kindle books at once
If you don't want to use collections, you can "push" books in batches of up to 200 from your computer. Navigate to the Content Library on Amazon. Select the tab. The most efficient way to download multiple books
On your device, ensure Wi-Fi is on and tap to begin the mass download. Method 3: Kindle for PC/Mac Application Long-press the collection name (or click the three dots)
Click and choose your target Kindle or app.